Automatic ignition timer



Dec. 20, 1938. g JJBQHLI 2,141,029

- AUTOMATIC IGNITION TIMER Filed Ma lli 1937 INVENTOR.

wilt/L938: Q Jacob AB/OhZi/ Xbd'wzw M M. ATTORNEY.

Patented Dec. 20, 1938 I UNITED STATES PATENT OFFICE AUTOMATIC IGNITION TIMER Jakob Bohli, Solothurn, Switzerland, assignor to Bendix Aviation Corporation, South Bend, Ind., a corporation of Delaware Application May 11, 1937, Serial No. 142,062 In Germany and Switzerland May 27, 1936 2 Claims. (01. 123---117) The present invention relates to an automatic a throttle device it) to the intake conduit H of adjustment of the ignition point for explosion the carburetor. In certain cases, the pressureengines. Automatic adjustments of the ignition sensitive member may be connected to the intake point for explosion engines are known by which H with the interposition of a throttle device here 5 the location of the ignition point within the shown in dot and dash lines, by means of anthermic cycle is adjusted by means of centrifuother tube i2. gal governors which are correlated in function The piston rod 13 of the piston 8 is here dito the speed of rotation of the engine. The correctly connected with the adustment plate 54 relation is effected by means of springs which are of a distributor, upon which, as usual, the breaker 10 located in the interior of the apparatus, for a is mounted. 10 certain fuel mixture, for a certain condition of It is now clear that the pressure prevailing in the engine, and throttle opening. If there are the exhaustpipe may be transmitted through the changes in one of the mentioned conditions, it pneumatic connections 3, 4, 5 and 6 from this is necessary that the ignition be adapted to the pipe to the pressure-sensitive member I. Now

new condition, if the maximum power of the en the pressure will be proportionately greater as 15 gine is to be obtained without knocking. The the charge in the cylinder and the speed of rocorrelating springs of the ignition systems detertation of the engine increases. With fluctuatmine a certain adjustment curve which cannot ing charge and varying speed of rotation there be changed without the disassembly of the apwill be derived a combined relation which adapts paratus, and so the relationships once estabitself advantageously to accommodate the ad- 20 lished remain constant for each cylinder charge. justment of the ignition point accurately to the Only a manual adjustment is possible. This may conditions prevailing at each instant. Accordserve for a certain speed of rotation, but must ingly now as it is wished to have the adjustment continually be adapted to increases or decreases curve more or less steep, the antechamber 6 may of the speed of rotation. be connected more or less with the intake con- 25 The object of the invention is a procedure duit by means of the throttle device It], and thus whereby the adjustment of the ignition point of the relation to the condition of the engine adexplosion engines is adapted to the existing workjusted at will without the automatic operation ing conditions, by making the timing of the igsuffering thereby.

nition point dependent on the pressure conditions What is claimed is: 30

in the exhaust. There conditions prevail which 1. In combination with an internal combusare naturally dependent upon the speed of rotion engine having intake and exhaust manifolds tation and the charge. It is thus very advantaand an adjustable ignition system means for augeous to make use of both these already tomatically adjusting the ignition in accordance combined factors for effecting this automatic with the variations in pressure of the intake and 35 adjustment of the ignition point. Moreover, exhaust gases, and manually adjustable means means can very easily be interposed which enfor selectively causing one of said gas pressures ables the ignition curve to incline more or less to predominate over the other in its effect on the steeply as desired. ignition adjustment.

On the accompanying drawing, there is illus- 2. In combination with an internal combus- 40 trated schematically, and only as far as is nection engine having intake and exhaust manifolds essary for the understanding of the invention, and an adjustable ignition system, a pressure an apparatus which permits carrying out the chamber, means connecting said chamber to the procedure according to the invention. intake and exhaust manifolds whereby the pres- The exhaust manifold of the explosion engine sure therein is a resultant of the pressure of the 45 is designated by numeral I. Between this manigases in said manifolds and a pressure responsive .fold l and the muflier 2, a tube 3 branches off, device operable by pressures within said cham- Which leads to a filter 4, where entrained dust her for adjusting said ignition system and throtparticles are caught. From this filter another tling means in said connecting means manually tube 5 leads to an antechamber 6, to the sides-of operable to cause one of said gas pressures to 50 which are connected a pressure-sensitive memhave a predominating effect on the pressure in her 1 (in the present example a cylinder with a said chamber. piston 8) and another tube 9 which leads through JAKOB BOI-ILI. 

